ELECTRON MICROSCOPY

Sample

tetrameric complex of alpha-latrotoxin

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK II
Cryogen Name ETHANE
Sample Vitrification Details ?
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 70971
Reported Resolution (Å) 3.2
Resolution Method FSC 0.143 CUT-OFF
Other Details The resolution of 3.2 Angstroem is that from focussed refinements on the core of the complex, which is the best-resolved from the maps that were used to create the here-deposited hybrid map.
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol AB INITIO MODEL
Refinement Target cross correlation 0.61
Overall B Value 89.73
Fitting Procedure ?
Details An Alphafold2 prediction was initially fit into the reconstruction using ChimeraX and then manually refined using Coot and energy minimized using Phenix.
Data Acquisition
Detector Type TFS FALCON 4i (4k x 4k)
Electron Dose (electrons/Å2) 50
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 300
Maximum Defocus (nm) 1700
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2.7
Imaging Mode BRIGHT FIELD
Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification 215000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION crYOLO 1.8.3
IMAGE ACQUISITION EPU 3.2.0.4776
CTF CORRECTION RELION 4.01
MODEL FITTING UCSF ChimeraX 1.7.dev2023
INITIAL EULER ASSIGNMENT RELION 4.01
FINAL EULER ASSIGNMENT RELION 4.01
CLASSIFICATION RELION 4.01
RECONSTRUCTION RELION 4.01
MODEL REFINEMENT Coot 0.9.8.1
MODEL REFINEMENT PHENIX 1.20.1
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?